问题补充:
Most students think Lady Gaga is one of singers in USA now.
A. popular
B. more popular
C. most popular
D. the most popular
答案:
A. popular
B. more popular
C. most popular
(答案→)D. the most popular
解析:形容词副词的比较级多用于两个事物进行对比,三个及三个以上事物进行对比时用最高级。One of the后接形容词最高级表示最……之一,因此选D,最流行的歌手之一。